The nurse is developing a care plan for a client who will be self-administering a metered-dose inhaler. Which statement reflects a measurable outcome?

The correct answer is D because it specifies a measurable outcome that can be observed and evaluated objectively. By demonstrating the proper technique of self-administering a metered-dose inhaler, the client's understanding and ability can be directly assessed. Choice A is vague and subjective, as understanding may not necessarily translate to practical application. Choice B only mentions knowledge without addressing application. Choice C is similar to choice D but lacks the clarity of a specific action being demonstrated.